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Linear Technology Electronic Components Datasheet

LTC3126EFE Datasheet

2.5A Synchronous Step-Down Regulator

No Preview Available !

Features
n Seamless, Automatic Transition Between Two Input
Power Sources
n Wide Input Voltage Range: 2.4V to 42V
n Wide Output Voltage Range: 0.818V to VIN
n Up to 2.5A Continuous Output Current
n Pin-Selectable Priority and Ideal Diode-OR Modes
n Burst Mode® Operation, IQ = 2µA
n 95% Efficiency at 1A, VIN = 12V, VOUT = 5V
n 1µA Current in Shutdown
n Programmable Input UVLO Thresholds
n Input Valid, Priority Channel and PGOOD Indicators
n 200kHz to 2.2MHz Fixed Frequency PWM
n Synchronizable to an External Clock
n Current Mode Control with 60ns Minimum On-Time
n Minimal External Components
n Thermally Enhanced 28-Lead 4mm × 5mm QFN and
28-Lead TSSOP Packages
Applications
n Portable Industrial/Communications Test Equipment
n Battery and Supercapacitor Backup Power
n Automotive Power with Battery Backup
n Uninterruptible Power Supplies
LTC3126
42V, 2.5A Synchronous
Step-Down Regulator with
No-Loss Input PowerPath
Description
The LTC®3126 is a high efficiency synchronous buck
converter with an internal no-loss PowerPath™ supporting
seamless operation from two separate input power sources.
Pin-selectable ideal diode-OR and priority input modes
with user programmable undervoltage lockout thresholds
provide full control over the transition between the input
power sources. The fast, automatic switchover provided
by the internal PowerPath eliminates the need for hold-up
capacitors and minimizes disturbances on the output rail.
An active input channel indicator and independent input
and output power good signals provide complete feedback
of the power system status.
A wide 2.4V to 42V input voltage range, 2.5A output cur-
rent capability and 2µA Burst Mode operation quiescent
current facilitate use of the LTC3126 with a wide variety
of power sources including supercapacitors, automo-
tive batteries, unregulated wall adapters and single to
multicell stacks of most battery chemistries. Additional
features include 1µA current in shutdown, internal soft-
start and thermal protection. The LTC3126 is available
in thermally enhanced 28-lead 4mm × 5mm QFN and
28-lead TSSOP packages.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
and PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Typical Application
2MHz, 3.3V/2.5A Supply from Automotive and Battery Inputs
0.1µF
0.1µF
AUTOMOTIVE
10V TO 24V
42V TRANSIENT
+
BATTERY
4.2V TO 24V
+
15µF
4.7µF
4.7µF
499k
249k
249k
VIN1 BST2 COM2 BST1 COM1
PVIN1
SW
EXTVCC
VIN2
PVIN2
FB
PVCC
VCC
ENA
LTC3126
VREF
VSET1
PRIORITY
VALID1
VALID2
PGOOD
VSET2
2.2µH
10pF
PWM/SYNC
DIODE GND
PGND
16.5k
RT
3126 TA01a
1.13M
374k
VOUT
3.3V
47µF 2.5A
Switchover to Battery Power, 2.5A Load
VIN1 5V/DIV
VIN2 5V/DIV
VOUT 200mV/DIV
AUTOMOTIVE
INPUT UNPLUGGED
INDUCTOR CURRENT 2A/DIV
PRIORITY 5V/DIV
50µs/DIV
3126 TA01b
3126f
For more information www.linear.com/LTC3126
1


Linear Technology Electronic Components Datasheet

LTC3126EFE Datasheet

2.5A Synchronous Step-Down Regulator

No Preview Available !

LTC3126
Absolute Maximum Ratings (Note 1)
PVIN1, PVIN2, VIN1, VIN2..............................................42V
EXTVCC......................................................................42V
VCC, PVCC.....................................................................6V
VREF, VSET1, VSET2, FB, RT...........................................6V
PWM/SYNC, DIODE, ENA............................................6V
VALID1, VALID2, PGOOD, PRIORITY.............................6V
BST1 Pin Above COM1................................................6V
BST2 Pin Above COM2................................................6V
Operating Junction Temperature Range
(Notes 2, 4)............................................. –40°C to 150°C
Storage Temperature.............................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
TSSOP............................................................... 300°C
Pin Configuration
TOP VIEW
28 27 26 25 24 23
VALID2 1
22 BST1
VCC 2
PVCC 3
EXTVCC 4
VSET1 5
VSET2 6
VREF 7
GND 8
29
PGND
21 COM1
20 SW
19 PGND
18 PGND
17 SW
16 COM2
15 BST2
9 10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
TJMAX = 150°C, θJA = 34°C/W
EXPOSED PAD (PIN 29) IS PGND, MUST BE SOLDERED TO PCB
TOP VIEW
VIN2 1
PWM/SYNC 2
VALID1 3
VALID2 4
VCC 5
PVCC 6
EXTVCC 7
VSET1 8
VSET2 9
VREF 10
GND 11
FB 12
RT 13
PGOOD 14
29
PGND
28 VIN1
27 PVIN1
26 DIODE
25 BST1
24 COM1
23 SW
22 PGND
21 PGND
20 SW
19 COM2
18 BST2
17 ENA
16 PVIN2
15 PRIORITY
FE PACKAGE
28-LEAD PLASTIC TSSOP
TJMAX = 150°C, θJA = 30°C/W
EXPOSED PAD (PIN 29) IS PGND, MUST BE SOLDERED TO PCB
Order Information http://www.linear.com/product/LTC3126#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3126EUFD#PBF
LTC3126EUFD#TRPBF 3126
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LTC3126IUFD#PBF
LTC3126IUFD#TRPBF 3126
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LTC3126EFE#PBF
LTC3126EFE#TRPBF
LTC3126FE
28-Lead Plastic TSSOP (4.4mm)
–40°C to 125°C
LTC3126IFE#PBF
LTC3126IFE#TRPBF
LTC3126FE
28-Lead Plastic TSSOP (4.4mm)
–40°C to 125°C
LTC3126HFE#PBF
LTC3126HFE#TRPBF
LTC3126FE
28-Lead Plastic TSSOP (4.4mm)
–40°C to 150°C
LTC3126MPFE#PBF
LTC3126MPFE#TRPBF LTC3126FE
28-Lead Plastic TSSOP (4.4mm)
–55°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
3126f
2
For more information www.linear.com/LTC3126


Part Number LTC3126EFE
Description 2.5A Synchronous Step-Down Regulator
Maker Linear
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